Edelbrock 60559 Details

Performer RPM rectangular-port heads have specially designed intake and exhaust ports for increased flow and velocity over standard big-block heads. These heads feature a highly-efficient 118cc open-style combustion chamber for maximum performance. Engineered with high-velocity 315cc long and 300cc short intake runners, they are designed for street/high-performance big-block Chevys operating from 2500-7000 rpm. The stainless steel, hardened tip 2.19'' intake and 1.88'' exhaust valves have smaller-than-stock 11/32'' valve stems to promote excellent flow and lighter valve weight. The deck surface and water jackets were specially designed to work with all big-block Chevrolet engine blocks. Heads include top-quality ARP rocker studs, bronze guides and hardened, ductile iron valve seats.

Tech Note: The Spark plug is closer to center of bore, for use with flat top or low dome pistons and will interfere with high-dome pistons for open chamber heads. If a high compression domed piston is to be used, purchase a piston designed for use with this Edelbrock cylinder head.

Tech Tip: To gain more spark plug clearance, Edelbrock recommends using Champion RC Series plugs such as the RC12YC. They are 0.230'' shorter than a conventional spark plug and have a 5/8'' hex for easier access.

Designed for street/high-performance big-blocks operating from 2500-7000 rpm

Specially designed ports for increased flow and velocity over standard big-block heads

Some parts are not legal for use in California or other states with similar laws / regulations

Motor Vehicles

WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.

Tools:

WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

Electrical Cords

WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.